Electrogenerated chemiluminescence of a series of donor - Acceptor molecules and X-ray crystallographic evidence for the reaction mechanisms
2007 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 111, no 26, 9595-9602 p.Article in journal (Refereed) Published
Three series of donor-acceptor pi-conjugated (D-pi-A) molecules 1-3 have been synthesized with a 2,3,6,7-tetrahydro-1H,5H-pyrido[3,2,1-ij]quinolinyl (Julolidine group), N,N-dimethylamino, or N,N-diphenylamino group as the donor moiety, a phenylvinyl or thienylvinyl unit as the bridge, and a bromide or aldehyde group as the acceptor moiety. The photophysical, electrochemical, and electrogenerated chemiluminescence (ECL) characters of these compounds have been studied in a 1:1 PhH/MeCN solution. Three different categories of ECL mechanisms for each of the three families of compounds are discussed, respectively. Compounds 1a-c produce typical and simple monomer ECL emission resulting from the annihilation of their radical cations and radical anions. The ECL emission of compounds 2a-c can be ascribed as an excimer emission. Compounds 3a-c exhibit an aggregate ECL emission. X-ray crystal structures of compounds 1b, 2a, and 3a provide further proof for the above-mentioned reaction mechanisms. All these compounds show stable ECL emission via the singlet excited state without the addition of any co-reactant or additional compound.
Place, publisher, year, edition, pages
2007. Vol. 111, no 26, 9595-9602 p.
intramolecular charge-transfer, electrochemiluminescence detection, photophysical properties, excimer emission, amino-acids, system, ecl, electrochemistry, ruthenium, amplification
IdentifiersURN: urn:nbn:se:kth:diva-16729DOI: 10.1021/jp071015nISI: 000247599300082ScopusID: 2-s2.0-34547458061OAI: oai:DiVA.org:kth-16729DiVA: diva2:334772
QC 201005252010-08-052010-08-05Bibliographically approved